PREN ISO 11114-1 : DRAFT 2009

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Materials
  4.1 General
  4.2 Cylinder material
  4.3 Valve materials
  4.4 Particular considerations
5 Compatibility criteria
  5.1 General
  5.2 Corrosion
      5.2.1 Corrosion in dry conditions
      5.2.2 Corrosion in wet conditions
      5.2.3 Corrosion by impurities
  5.3 Hydrogen embrittlement phenomenom
  5.4 Generation of dangerous products
  5.5 Violent reactions (e.g. ignition)
  5.6 Embrittlement at low temperature
6 Material compatibility
  6.1 Table of compatibility for single gases
  6.2 Compatibility for gas mixtures
  6.3 Conventions and symbols used in table 1
  6.4 Abbreviations for materials
Annex A (normative) - Gas/Materials NQSAB
        compatibility code
  A.1 General
  A.2 Material classes and compatibility identification
      A.2.1 Normalized and carbon steels (N)
      A.2.2 Quenched and tempered steels (Q)
      A.2.3 Stainless steels (S)
      A.2.4 Aluminium alloys (A)
      A.2.5 Brass copper and copper alloys (B)
  A.3 NQSAB code
  A.4 Groups of gases

Gives requirements for the selection and evaluation of compatibility between metallic gas cylinder and valve materials, and the gas content.